ditto, i'm on osx 10.5.8 and have that problem
If you're on OS X, you need to fix the permissions on some folders & files. Do a "Get Info" (Comman-I) on the following folders.
1) The application folder, "Harman How To Listen".
2)/Library/Application Support/Harman International
Give "everyone" Read & Write permissions.
When you change permissions, select the "Apply to enclosed items..." under the little gear drop down.
Also, there appears to be a problem with uppercase & lowercase in usernames. Use all lowercase. When I did a mixed upper & lower case name, it always complained the password was incorrect. When I switched to all lowercase, the problem went away. This likely applies to both Macs & Windows.
I've been making my passwords "password". None of the data goes anywhere; the user and password are just to keep track of local data. I'm going to create different users for the different systems I run it on - earbuds, cans, home stereo, etc.
Also, I wouldn't get too bent out of shape about the quirks. It's beta software, I'm sure they'll have another release soon.